- Changed XMIT_TOP_DIR to XMIT_DEL_START.
[rsync.git] / flist.c
1 /*
2    Copyright (C) Andrew Tridgell 1996
3    Copyright (C) Paul Mackerras 1996
4    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
5
6    This program is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 2 of the License, or
9    (at your option) any later version.
10
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15
16    You should have received a copy of the GNU General Public License
17    along with this program; if not, write to the Free Software
18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 /** @file flist.c
22  * Generate and receive file lists
23  *
24  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
25  *
26  **/
27
28 #include "rsync.h"
29
30 extern struct stats stats;
31
32 extern int verbose;
33 extern int do_progress;
34 extern int am_root;
35 extern int am_server;
36 extern int am_daemon;
37 extern int am_sender;
38 extern int always_checksum;
39 extern int module_id;
40 extern int ignore_errors;
41 extern int numeric_ids;
42
43 extern int cvs_exclude;
44
45 extern int recurse;
46 extern int keep_dirs;
47 extern char curr_dir[MAXPATHLEN];
48 extern int filesfrom_fd;
49
50 extern int one_file_system;
51 extern int keep_dirlinks;
52 extern int preserve_links;
53 extern int preserve_hard_links;
54 extern int preserve_perms;
55 extern int preserve_devices;
56 extern int preserve_uid;
57 extern int preserve_gid;
58 extern int relative_paths;
59 extern int implied_dirs;
60 extern int copy_links;
61 extern int copy_unsafe_links;
62 extern int protocol_version;
63 extern int sanitize_paths;
64 extern int delete_excluded;
65 extern int orig_umask;
66 extern int list_only;
67
68 extern struct exclude_list_struct exclude_list;
69 extern struct exclude_list_struct server_exclude_list;
70 extern struct exclude_list_struct local_exclude_list;
71
72 int io_error;
73
74 static char empty_sum[MD4_SUM_LENGTH];
75 static unsigned int file_struct_len;
76 static struct file_list *received_flist;
77
78 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
79 static void output_flist(struct file_list *flist, const char *whose_list);
80
81 void init_flist(void)
82 {
83         struct file_struct f;
84
85         /* Figure out how big the file_struct is without trailing padding */
86         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
87 }
88
89
90 static int show_filelist_p(void)
91 {
92         return verbose && keep_dirs && !am_server;
93 }
94
95 static void start_filelist_progress(char *kind)
96 {
97         rprintf(FINFO, "%s ... ", kind);
98         if (verbose > 1 || do_progress)
99                 rprintf(FINFO, "\n");
100         rflush(FINFO);
101 }
102
103
104 static void emit_filelist_progress(const struct file_list *flist)
105 {
106         rprintf(FINFO, " %d files...\r", flist->count);
107 }
108
109
110 static void maybe_emit_filelist_progress(const struct file_list *flist)
111 {
112         if (do_progress && show_filelist_p() && (flist->count % 100) == 0)
113                 emit_filelist_progress(flist);
114 }
115
116
117 static void finish_filelist_progress(const struct file_list *flist)
118 {
119         if (do_progress) {
120                 /* This overwrites the progress line */
121                 rprintf(FINFO, "%d file%sto consider\n",
122                         flist->count, flist->count == 1 ? " " : "s ");
123         } else
124                 rprintf(FINFO, "done\n");
125 }
126
127 void show_flist_stats(void)
128 {
129         /* Nothing yet */
130 }
131
132
133 static void list_file_entry(struct file_struct *f)
134 {
135         char perms[11];
136
137         if (!f->basename) {
138                 /* this can happen if duplicate names were removed */
139                 return;
140         }
141
142         permstring(perms, f->mode);
143
144 #if SUPPORT_LINKS
145         if (preserve_links && S_ISLNK(f->mode)) {
146                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
147                         perms,
148                         (double)f->length, timestring(f->modtime),
149                         f_name(f), f->u.link);
150         } else
151 #endif
152         {
153                 rprintf(FINFO, "%s %11.0f %s %s\n",
154                         perms,
155                         (double)f->length, timestring(f->modtime),
156                         f_name(f));
157         }
158 }
159
160
161 /**
162  * Stat either a symlink or its referent, depending on the settings of
163  * copy_links, copy_unsafe_links, etc.
164  *
165  * @retval -1 on error
166  *
167  * @retval 0 for success
168  *
169  * @post If @p path is a symlink, then @p linkbuf (of size @c
170  * MAXPATHLEN) contains the symlink target.
171  *
172  * @post @p buffer contains information about the link or the
173  * referrent as appropriate, if they exist.
174  **/
175 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
176 {
177 #if SUPPORT_LINKS
178         if (copy_links)
179                 return do_stat(path, buffer);
180         if (link_stat(path, buffer, 0) < 0)
181                 return -1;
182         if (S_ISLNK(buffer->st_mode)) {
183                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
184                 if (l == -1)
185                         return -1;
186                 linkbuf[l] = 0;
187                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
188                         if (verbose > 1) {
189                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
190                                         path, linkbuf);
191                         }
192                         return do_stat(path, buffer);
193                 }
194         }
195         return 0;
196 #else
197         return do_stat(path, buffer);
198 #endif
199 }
200
201 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
202 {
203 #if SUPPORT_LINKS
204         if (copy_links)
205                 return do_stat(path, buffer);
206         if (do_lstat(path, buffer) < 0)
207                 return -1;
208         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
209                 STRUCT_STAT st;
210                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
211                         *buffer = st;
212         }
213         return 0;
214 #else
215         return do_stat(path, buffer);
216 #endif
217 }
218
219 /*
220  * This function is used to check if a file should be included/excluded
221  * from the list of files based on its name and type etc.  The value of
222  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
223  */
224 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
225 {
226         int rc;
227
228 #if 0 /* This currently never happens, so avoid a useless compare. */
229         if (exclude_level == NO_EXCLUDES)
230                 return 0;
231 #endif
232         if (fname) {
233                 /* never exclude '.', even if somebody does --exclude '*' */
234                 if (fname[0] == '.' && !fname[1])
235                         return 0;
236                 /* Handle the -R version of the '.' dir. */
237                 if (fname[0] == '/') {
238                         int len = strlen(fname);
239                         if (fname[len-1] == '.' && fname[len-2] == '/')
240                                 return 0;
241                 }
242         }
243         if (server_exclude_list.head
244             && check_exclude(&server_exclude_list, fname, is_dir) < 0)
245                 return 1;
246         if (exclude_level != ALL_EXCLUDES)
247                 return 0;
248         if (exclude_list.head
249             && (rc = check_exclude(&exclude_list, fname, is_dir)) != 0)
250                 return rc < 0;
251         if (local_exclude_list.head
252             && check_exclude(&local_exclude_list, fname, is_dir) < 0)
253                 return 1;
254         return 0;
255 }
256
257 /* used by the one_file_system code */
258 static dev_t filesystem_dev;
259
260 static void set_filesystem(char *fname)
261 {
262         STRUCT_STAT st;
263         if (do_stat(fname, &st) != 0)
264                 return;
265         filesystem_dev = st.st_dev;
266 }
267
268
269 static int to_wire_mode(mode_t mode)
270 {
271 #if SUPPORT_LINKS
272         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
273                 return (mode & ~(_S_IFMT)) | 0120000;
274 #endif
275         return (int)mode;
276 }
277
278 static mode_t from_wire_mode(int mode)
279 {
280         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
281                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
282         return (mode_t)mode;
283 }
284
285
286 static void send_directory(int f, struct file_list *flist, char *dir);
287
288 static char *flist_dir;
289 static int flist_dir_len;
290
291
292 /**
293  * Make sure @p flist is big enough to hold at least @p flist->count
294  * entries.
295  **/
296 void flist_expand(struct file_list *flist)
297 {
298         struct file_struct **new_ptr;
299
300         if (flist->count < flist->malloced)
301                 return;
302
303         if (flist->malloced < FLIST_START)
304                 flist->malloced = FLIST_START;
305         else if (flist->malloced >= FLIST_LINEAR)
306                 flist->malloced += FLIST_LINEAR;
307         else
308                 flist->malloced *= 2;
309
310         /*
311          * In case count jumped or we are starting the list
312          * with a known size just set it.
313          */
314         if (flist->malloced < flist->count)
315                 flist->malloced = flist->count;
316
317         new_ptr = realloc_array(flist->files, struct file_struct *,
318                                 flist->malloced);
319
320         if (verbose >= 2 && flist->malloced != FLIST_START) {
321                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
322                     who_am_i(),
323                     (double)sizeof flist->files[0] * flist->malloced,
324                     (new_ptr == flist->files) ? " not" : "");
325         }
326
327         flist->files = new_ptr;
328
329         if (!flist->files)
330                 out_of_memory("flist_expand");
331 }
332
333 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
334 {
335         unsigned short flags;
336         static time_t modtime;
337         static mode_t mode;
338         static int64 dev;
339         static dev_t rdev;
340         static uint32 rdev_major;
341         static uid_t uid;
342         static gid_t gid;
343         static char lastname[MAXPATHLEN];
344         char fname[MAXPATHLEN];
345         int l1, l2;
346
347         if (f == -1)
348                 return;
349
350         if (!file) {
351                 write_byte(f, 0);
352                 modtime = 0, mode = 0;
353                 dev = 0, rdev = makedev(0, 0);
354                 rdev_major = 0;
355                 uid = 0, gid = 0;
356                 *lastname = '\0';
357                 return;
358         }
359
360         io_write_phase = "send_file_entry";
361
362         f_name_to(file, fname);
363
364         flags = base_flags;
365
366         if (file->mode == mode)
367                 flags |= XMIT_SAME_MODE;
368         else
369                 mode = file->mode;
370         if (preserve_devices) {
371                 if (protocol_version < 28) {
372                         if (IS_DEVICE(mode)) {
373                                 if (file->u.rdev == rdev)
374                                         flags |= XMIT_SAME_RDEV_pre28;
375                                 else
376                                         rdev = file->u.rdev;
377                         } else
378                                 rdev = makedev(0, 0);
379                 } else if (IS_DEVICE(mode)) {
380                         rdev = file->u.rdev;
381                         if ((uint32)major(rdev) == rdev_major)
382                                 flags |= XMIT_SAME_RDEV_MAJOR;
383                         else
384                                 rdev_major = major(rdev);
385                         if ((uint32)minor(rdev) <= 0xFFu)
386                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
387                 }
388         }
389         if (file->uid == uid)
390                 flags |= XMIT_SAME_UID;
391         else
392                 uid = file->uid;
393         if (file->gid == gid)
394                 flags |= XMIT_SAME_GID;
395         else
396                 gid = file->gid;
397         if (file->modtime == modtime)
398                 flags |= XMIT_SAME_TIME;
399         else
400                 modtime = file->modtime;
401
402 #if SUPPORT_HARD_LINKS
403         if (file->link_u.idev) {
404                 if (file->F_DEV == dev) {
405                         if (protocol_version >= 28)
406                                 flags |= XMIT_SAME_DEV;
407                 } else
408                         dev = file->F_DEV;
409                 flags |= XMIT_HAS_IDEV_DATA;
410         }
411 #endif
412
413         for (l1 = 0;
414             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
415             l1++) {}
416         l2 = strlen(fname+l1);
417
418         if (l1 > 0)
419                 flags |= XMIT_SAME_NAME;
420         if (l2 > 255)
421                 flags |= XMIT_LONG_NAME;
422
423         /* We must make sure we don't send a zero flag byte or the
424          * other end will terminate the flist transfer.  Note that
425          * the use of XMIT_DEL_START on a non-dir has no meaning, so
426          * it's harmless way to add a bit to the first flag byte. */
427         if (protocol_version >= 28) {
428                 if (!flags && !S_ISDIR(mode))
429                         flags |= XMIT_DEL_START;
430                 if ((flags & 0xFF00) || !flags) {
431                         flags |= XMIT_EXTENDED_FLAGS;
432                         write_byte(f, flags);
433                         write_byte(f, flags >> 8);
434                 } else
435                         write_byte(f, flags);
436         } else {
437                 if (!(flags & 0xFF) && !S_ISDIR(mode))
438                         flags |= XMIT_DEL_START;
439                 if (!(flags & 0xFF))
440                         flags |= XMIT_LONG_NAME;
441                 write_byte(f, flags);
442         }
443         if (flags & XMIT_SAME_NAME)
444                 write_byte(f, l1);
445         if (flags & XMIT_LONG_NAME)
446                 write_int(f, l2);
447         else
448                 write_byte(f, l2);
449         write_buf(f, fname + l1, l2);
450
451         write_longint(f, file->length);
452         if (!(flags & XMIT_SAME_TIME))
453                 write_int(f, modtime);
454         if (!(flags & XMIT_SAME_MODE))
455                 write_int(f, to_wire_mode(mode));
456         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
457                 if (!numeric_ids)
458                         add_uid(uid);
459                 write_int(f, uid);
460         }
461         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
462                 if (!numeric_ids)
463                         add_gid(gid);
464                 write_int(f, gid);
465         }
466         if (preserve_devices && IS_DEVICE(mode)) {
467                 if (protocol_version < 28) {
468                         if (!(flags & XMIT_SAME_RDEV_pre28))
469                                 write_int(f, (int)rdev);
470                 } else {
471                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
472                                 write_int(f, major(rdev));
473                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
474                                 write_byte(f, minor(rdev));
475                         else
476                                 write_int(f, minor(rdev));
477                 }
478         }
479
480 #if SUPPORT_LINKS
481         if (preserve_links && S_ISLNK(mode)) {
482                 int len = strlen(file->u.link);
483                 write_int(f, len);
484                 write_buf(f, file->u.link, len);
485         }
486 #endif
487
488 #if SUPPORT_HARD_LINKS
489         if (flags & XMIT_HAS_IDEV_DATA) {
490                 if (protocol_version < 26) {
491                         /* 32-bit dev_t and ino_t */
492                         write_int(f, dev);
493                         write_int(f, file->F_INODE);
494                 } else {
495                         /* 64-bit dev_t and ino_t */
496                         if (!(flags & XMIT_SAME_DEV))
497                                 write_longint(f, dev);
498                         write_longint(f, file->F_INODE);
499                 }
500         }
501 #endif
502
503         if (always_checksum) {
504                 char *sum;
505                 if (S_ISREG(mode))
506                         sum = file->u.sum;
507                 else if (protocol_version < 28) {
508                         /* Prior to 28, we sent a useless set of nulls. */
509                         sum = empty_sum;
510                 } else
511                         sum = NULL;
512                 if (sum) {
513                         write_buf(f, sum,
514                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
515                 }
516         }
517
518         strlcpy(lastname, fname, MAXPATHLEN);
519
520         io_write_phase = "unknown";
521 }
522
523
524
525 void receive_file_entry(struct file_struct **fptr, unsigned short flags,
526                         struct file_list *flist, int f)
527 {
528         static time_t modtime;
529         static mode_t mode;
530         static int64 dev;
531         static dev_t rdev;
532         static uint32 rdev_major;
533         static uid_t uid;
534         static gid_t gid;
535         static char lastname[MAXPATHLEN], *lastdir;
536         static int lastdir_depth, lastdir_len = -1;
537         char thisname[MAXPATHLEN];
538         unsigned int l1 = 0, l2 = 0;
539         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
540         OFF_T file_length;
541         char *basename, *dirname, *bp;
542         struct file_struct *file;
543
544         if (!fptr) {
545                 modtime = 0, mode = 0;
546                 dev = 0, rdev = makedev(0, 0);
547                 rdev_major = 0;
548                 uid = 0, gid = 0;
549                 *lastname = '\0';
550                 lastdir_len = -1;
551                 return;
552         }
553
554         if (flags & XMIT_SAME_NAME)
555                 l1 = read_byte(f);
556
557         if (flags & XMIT_LONG_NAME)
558                 l2 = read_int(f);
559         else
560                 l2 = read_byte(f);
561
562         if (l2 >= MAXPATHLEN - l1) {
563                 rprintf(FERROR,
564                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
565                         flags, l1, l2, lastname);
566                 overflow("receive_file_entry");
567         }
568
569         strlcpy(thisname, lastname, l1 + 1);
570         read_sbuf(f, &thisname[l1], l2);
571         thisname[l1 + l2] = 0;
572
573         strlcpy(lastname, thisname, MAXPATHLEN);
574
575         clean_fname(thisname, 0);
576
577         if (sanitize_paths)
578                 sanitize_path(thisname, thisname, "", 0);
579
580         if ((basename = strrchr(thisname, '/')) != NULL) {
581                 dirname_len = ++basename - thisname; /* counts future '\0' */
582                 if (lastdir_len == dirname_len - 1
583                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
584                         dirname = lastdir;
585                         dirname_len = 0; /* indicates no copy is needed */
586                 } else
587                         dirname = thisname;
588         } else {
589                 basename = thisname;
590                 dirname = NULL;
591                 dirname_len = 0;
592         }
593         basename_len = strlen(basename) + 1; /* count the '\0' */
594
595         file_length = read_longint(f);
596         if (!(flags & XMIT_SAME_TIME))
597                 modtime = (time_t)read_int(f);
598         if (!(flags & XMIT_SAME_MODE))
599                 mode = from_wire_mode(read_int(f));
600
601         if (preserve_uid && !(flags & XMIT_SAME_UID))
602                 uid = (uid_t)read_int(f);
603         if (preserve_gid && !(flags & XMIT_SAME_GID))
604                 gid = (gid_t)read_int(f);
605
606         if (preserve_devices) {
607                 if (protocol_version < 28) {
608                         if (IS_DEVICE(mode)) {
609                                 if (!(flags & XMIT_SAME_RDEV_pre28))
610                                         rdev = (dev_t)read_int(f);
611                         } else
612                                 rdev = makedev(0, 0);
613                 } else if (IS_DEVICE(mode)) {
614                         uint32 rdev_minor;
615                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
616                                 rdev_major = read_int(f);
617                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
618                                 rdev_minor = read_byte(f);
619                         else
620                                 rdev_minor = read_int(f);
621                         rdev = makedev(rdev_major, rdev_minor);
622                 }
623         }
624
625 #if SUPPORT_LINKS
626         if (preserve_links && S_ISLNK(mode)) {
627                 linkname_len = read_int(f) + 1; /* count the '\0' */
628                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
629                         rprintf(FERROR, "overflow: linkname_len=%d\n",
630                                 linkname_len - 1);
631                         overflow("receive_file_entry");
632                 }
633         }
634         else
635 #endif
636                 linkname_len = 0;
637
638         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
639
640         alloc_len = file_struct_len + dirname_len + basename_len
641                   + linkname_len + sum_len;
642         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
643
644         file = *fptr = (struct file_struct *)bp;
645         memset(bp, 0, file_struct_len);
646         bp += file_struct_len;
647
648         file->flags = flags & XMIT_DEL_START ? FLAG_DEL_START : 0;
649         file->modtime = modtime;
650         file->length = file_length;
651         file->mode = mode;
652         file->uid = uid;
653         file->gid = gid;
654
655         if (dirname_len) {
656                 file->dirname = lastdir = bp;
657                 lastdir_len = dirname_len - 1;
658                 memcpy(bp, dirname, dirname_len - 1);
659                 bp += dirname_len;
660                 bp[-1] = '\0';
661                 if (sanitize_paths)
662                         lastdir_depth = count_dir_elements(lastdir);
663         } else if (dirname)
664                 file->dirname = dirname;
665
666         file->basename = bp;
667         memcpy(bp, basename, basename_len);
668         bp += basename_len;
669
670         if (preserve_devices && IS_DEVICE(mode))
671                 file->u.rdev = rdev;
672
673 #if SUPPORT_LINKS
674         if (linkname_len) {
675                 file->u.link = bp;
676                 read_sbuf(f, bp, linkname_len - 1);
677                 if (sanitize_paths)
678                         sanitize_path(bp, bp, "", lastdir_depth);
679                 bp += linkname_len;
680         }
681 #endif
682
683 #if SUPPORT_HARD_LINKS
684         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
685                 flags |= XMIT_HAS_IDEV_DATA;
686         if (flags & XMIT_HAS_IDEV_DATA) {
687                 int64 inode;
688                 if (protocol_version < 26) {
689                         dev = read_int(f);
690                         inode = read_int(f);
691                 } else {
692                         if (!(flags & XMIT_SAME_DEV))
693                                 dev = read_longint(f);
694                         inode = read_longint(f);
695                 }
696                 if (flist->hlink_pool) {
697                         file->link_u.idev = pool_talloc(flist->hlink_pool,
698                             struct idev, 1, "inode_table");
699                         file->F_INODE = inode;
700                         file->F_DEV = dev;
701                 }
702         }
703 #endif
704
705         if (always_checksum) {
706                 char *sum;
707                 if (sum_len) {
708                         file->u.sum = sum = bp;
709                         /*bp += sum_len;*/
710                 } else if (protocol_version < 28) {
711                         /* Prior to 28, we get a useless set of nulls. */
712                         sum = empty_sum;
713                 } else
714                         sum = NULL;
715                 if (sum) {
716                         read_buf(f, sum,
717                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
718                 }
719         }
720
721         if (!preserve_perms) {
722                 /* set an appropriate set of permissions based on original
723                  * permissions and umask. This emulates what GNU cp does */
724                 file->mode &= ~orig_umask;
725         }
726 }
727
728
729 /**
730  * Create a file_struct for a named file by reading its stat()
731  * information and performing extensive checks against global
732  * options.
733  *
734  * @return the new file, or NULL if there was an error or this file
735  * should be excluded.
736  *
737  * @todo There is a small optimization opportunity here to avoid
738  * stat()ing the file in some circumstances, which has a certain cost.
739  * We are called immediately after doing readdir(), and so we may
740  * already know the d_type of the file.  We could for example avoid
741  * statting directories if we're not recursing, but this is not a very
742  * important case.  Some systems may not have d_type.
743  **/
744 struct file_struct *make_file(char *fname, struct file_list *flist,
745                               int exclude_level)
746 {
747         static char *lastdir;
748         static int lastdir_len = -1;
749         struct file_struct *file;
750         STRUCT_STAT st;
751         char sum[SUM_LENGTH];
752         char thisname[MAXPATHLEN];
753         char linkname[MAXPATHLEN];
754         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
755         char *basename, *dirname, *bp;
756         unsigned short flags = 0;
757
758         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
759                 lastdir_len = -1;
760
761         if (strlcpy(thisname, fname, sizeof thisname)
762             >= sizeof thisname - flist_dir_len) {
763                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
764                 return NULL;
765         }
766         clean_fname(thisname, 0);
767         if (sanitize_paths)
768                 sanitize_path(thisname, thisname, "", 0);
769
770         memset(sum, 0, SUM_LENGTH);
771
772         if (readlink_stat(thisname, &st, linkname) != 0) {
773                 int save_errno = errno;
774                 /* See if file is excluded before reporting an error. */
775                 if (exclude_level != NO_EXCLUDES
776                     && check_exclude_file(thisname, 0, exclude_level))
777                         return NULL;
778                 if (save_errno == ENOENT) {
779 #if SUPPORT_LINKS
780                         /* Avoid "vanished" error if symlink points nowhere. */
781                         if (copy_links && do_lstat(thisname, &st) == 0
782                             && S_ISLNK(st.st_mode)) {
783                                 io_error |= IOERR_GENERAL;
784                                 rprintf(FERROR, "symlink has no referent: %s\n",
785                                         full_fname(thisname));
786                         } else
787 #endif
788                         {
789                                 enum logcode c = am_daemon && protocol_version < 28
790                                     ? FERROR : FINFO;
791                                 io_error |= IOERR_VANISHED;
792                                 rprintf(c, "file has vanished: %s\n",
793                                         full_fname(thisname));
794                         }
795                 } else {
796                         io_error |= IOERR_GENERAL;
797                         rsyserr(FERROR, save_errno, "readlink %s failed",
798                                 full_fname(thisname));
799                 }
800                 return NULL;
801         }
802
803         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
804         if (exclude_level == NO_EXCLUDES)
805                 goto skip_excludes;
806
807         if (S_ISDIR(st.st_mode) && !keep_dirs) {
808                 rprintf(FINFO, "skipping directory %s\n", thisname);
809                 return NULL;
810         }
811
812         /* We only care about directories because we need to avoid recursing
813          * into a mount-point directory, not to avoid copying a symlinked
814          * file if -L (or similar) was specified. */
815         if (one_file_system && st.st_dev != filesystem_dev
816             && S_ISDIR(st.st_mode))
817                 flags |= FLAG_MOUNT_POINT;
818
819         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
820                 return NULL;
821
822         if (lp_ignore_nonreadable(module_id)) {
823 #if SUPPORT_LINKS
824                 if (!S_ISLNK(st.st_mode))
825 #endif
826                         if (access(thisname, R_OK) != 0)
827                                 return NULL;
828         }
829
830 skip_excludes:
831
832         if (verbose > 2) {
833                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
834                         who_am_i(), thisname, exclude_level);
835         }
836
837         if ((basename = strrchr(thisname, '/')) != NULL) {
838                 dirname_len = ++basename - thisname; /* counts future '\0' */
839                 if (lastdir_len == dirname_len - 1
840                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
841                         dirname = lastdir;
842                         dirname_len = 0; /* indicates no copy is needed */
843                 } else
844                         dirname = thisname;
845         } else {
846                 basename = thisname;
847                 dirname = NULL;
848                 dirname_len = 0;
849         }
850         basename_len = strlen(basename) + 1; /* count the '\0' */
851
852 #if SUPPORT_LINKS
853         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
854 #else
855         linkname_len = 0;
856 #endif
857
858         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
859
860         alloc_len = file_struct_len + dirname_len + basename_len
861             + linkname_len + sum_len;
862         if (flist) {
863                 bp = pool_alloc(flist->file_pool, alloc_len,
864                     "receive_file_entry");
865         } else {
866                 if (!(bp = new_array(char, alloc_len)))
867                         out_of_memory("receive_file_entry");
868         }
869
870         file = (struct file_struct *)bp;
871         memset(bp, 0, file_struct_len);
872         bp += file_struct_len;
873
874         file->flags = flags;
875         file->modtime = st.st_mtime;
876         file->length = st.st_size;
877         file->mode = st.st_mode;
878         file->uid = st.st_uid;
879         file->gid = st.st_gid;
880
881 #if SUPPORT_HARD_LINKS
882         if (flist && flist->hlink_pool) {
883                 if (protocol_version < 28) {
884                         if (S_ISREG(st.st_mode))
885                                 file->link_u.idev = pool_talloc(
886                                     flist->hlink_pool, struct idev, 1,
887                                     "inode_table");
888                 } else {
889                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
890                                 file->link_u.idev = pool_talloc(
891                                     flist->hlink_pool, struct idev, 1,
892                                     "inode_table");
893                 }
894         }
895         if (file->link_u.idev) {
896                 file->F_DEV = st.st_dev;
897                 file->F_INODE = st.st_ino;
898         }
899 #endif
900
901         if (dirname_len) {
902                 file->dirname = lastdir = bp;
903                 lastdir_len = dirname_len - 1;
904                 memcpy(bp, dirname, dirname_len - 1);
905                 bp += dirname_len;
906                 bp[-1] = '\0';
907         } else if (dirname)
908                 file->dirname = dirname;
909
910         file->basename = bp;
911         memcpy(bp, basename, basename_len);
912         bp += basename_len;
913
914 #ifdef HAVE_STRUCT_STAT_ST_RDEV
915         if (preserve_devices && IS_DEVICE(st.st_mode))
916                 file->u.rdev = st.st_rdev;
917 #endif
918
919 #if SUPPORT_LINKS
920         if (linkname_len) {
921                 file->u.link = bp;
922                 memcpy(bp, linkname, linkname_len);
923                 bp += linkname_len;
924         }
925 #endif
926
927         if (sum_len) {
928                 file->u.sum = bp;
929                 file_checksum(thisname, bp, st.st_size);
930                 /*bp += sum_len;*/
931         }
932
933         file->basedir = flist_dir;
934
935         /* This code is only used by the receiver when it is building
936          * a list of files for a delete pass. */
937         if (keep_dirlinks && linkname_len && flist) {
938                 STRUCT_STAT st2;
939                 int i = flist_find(received_flist, file);
940                 if (i >= 0 && S_ISDIR(received_flist->files[i]->mode)
941                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
942                         file->modtime = st2.st_mtime;
943                         file->length = st2.st_size;
944                         file->mode = st2.st_mode;
945                         file->uid = st2.st_uid;
946                         file->gid = st2.st_gid;
947                         file->u.link = NULL;
948                         if (file->link_u.idev) {
949                                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
950                                 file->link_u.idev = NULL;
951                         }
952                 }
953         }
954
955         if (!S_ISDIR(st.st_mode))
956                 stats.total_size += st.st_size;
957
958         return file;
959 }
960
961
962 void send_file_name(int f, struct file_list *flist, char *fname,
963                     int recursive, unsigned short base_flags)
964 {
965         struct file_struct *file;
966         char fbuf[MAXPATHLEN];
967
968         /* f is set to -1 when calculating deletion file list */
969         file = make_file(fname, flist,
970             f == -1 && delete_excluded? SERVER_EXCLUDES : ALL_EXCLUDES);
971
972         if (!file)
973                 return;
974
975         maybe_emit_filelist_progress(flist);
976
977         flist_expand(flist);
978
979         if (file->basename[0]) {
980                 flist->files[flist->count++] = file;
981                 send_file_entry(file, f, base_flags);
982         }
983
984         if (recursive && S_ISDIR(file->mode)
985             && !(file->flags & FLAG_MOUNT_POINT)) {
986                 struct exclude_list_struct last_list = local_exclude_list;
987                 local_exclude_list.head = local_exclude_list.tail = NULL;
988                 send_directory(f, flist, f_name_to(file, fbuf));
989                 if (verbose > 2) {
990                         rprintf(FINFO, "[%s] popping %sexclude list\n",
991                                 who_am_i(), local_exclude_list.debug_type);
992                 }
993                 clear_exclude_list(&local_exclude_list);
994                 local_exclude_list = last_list;
995         }
996 }
997
998
999 static void send_directory(int f, struct file_list *flist, char *dir)
1000 {
1001         DIR *d;
1002         struct dirent *di;
1003         char fname[MAXPATHLEN];
1004         unsigned int offset;
1005         char *p;
1006
1007         d = opendir(dir);
1008         if (!d) {
1009                 io_error |= IOERR_GENERAL;
1010                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(dir));
1011                 return;
1012         }
1013
1014         offset = strlcpy(fname, dir, MAXPATHLEN);
1015         p = fname + offset;
1016         if (offset >= MAXPATHLEN || p[-1] != '/') {
1017                 if (offset >= MAXPATHLEN - 1) {
1018                         io_error |= IOERR_GENERAL;
1019                         rprintf(FERROR, "skipping long-named directory: %s\n",
1020                                 full_fname(fname));
1021                         closedir(d);
1022                         return;
1023                 }
1024                 *p++ = '/';
1025                 offset++;
1026         }
1027
1028         if (cvs_exclude) {
1029                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
1030                     < MAXPATHLEN - offset) {
1031                         add_exclude_file(&local_exclude_list, fname,
1032                                          XFLG_WORD_SPLIT | XFLG_WORDS_ONLY);
1033                 } else {
1034                         io_error |= IOERR_GENERAL;
1035                         rprintf(FINFO,
1036                                 "cannot cvs-exclude in long-named directory %s\n",
1037                                 full_fname(fname));
1038                 }
1039         }
1040
1041         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1042                 char *dname = d_name(di);
1043                 if (dname[0] == '.' && (dname[1] == '\0'
1044                     || (dname[1] == '.' && dname[2] == '\0')))
1045                         continue;
1046                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset) {
1047                         send_file_name(f, flist, fname, recurse, 0);
1048                 } else {
1049                         io_error |= IOERR_GENERAL;
1050                         rprintf(FINFO,
1051                                 "cannot send long-named file %s\n",
1052                                 full_fname(fname));
1053                 }
1054         }
1055         if (errno) {
1056                 io_error |= IOERR_GENERAL;
1057                 rsyserr(FERROR, errno, "readdir(%s)", dir);
1058         }
1059
1060         closedir(d);
1061 }
1062
1063
1064 /**
1065  * This function is normally called by the sender, but the receiver also
1066  * uses it to construct its own file list if --delete has been specified.
1067  * The delete_files() function in receiver.c sets f to -1 so that we just
1068  * construct the file list in memory without sending it over the wire.  It
1069  * also has the side-effect of ignoring user-excludes if delete_excluded
1070  * is set (so that the delete list includes user-excluded files).
1071  **/
1072 struct file_list *send_file_list(int f, int argc, char *argv[])
1073 {
1074         int l;
1075         STRUCT_STAT st;
1076         char *p, *dir, olddir[sizeof curr_dir];
1077         char lastpath[MAXPATHLEN] = "";
1078         struct file_list *flist;
1079         int64 start_write;
1080         int use_ff_fd = 0;
1081
1082         if (show_filelist_p() && f != -1)
1083                 start_filelist_progress("building file list");
1084
1085         start_write = stats.total_written;
1086
1087         flist = flist_new(f == -1 ? WITHOUT_HLINK : WITH_HLINK,
1088             "send_file_list");
1089
1090         if (f != -1) {
1091                 io_start_buffering_out();
1092                 if (filesfrom_fd >= 0) {
1093                         if (argv[0] && !push_dir(argv[0])) {
1094                                 rsyserr(FERROR, errno, "push_dir %s failed",
1095                                         full_fname(argv[0]));
1096                                 exit_cleanup(RERR_FILESELECT);
1097                         }
1098                         use_ff_fd = 1;
1099                 }
1100         }
1101
1102         while (1) {
1103                 char fname2[MAXPATHLEN];
1104                 char *fname = fname2;
1105
1106                 if (use_ff_fd) {
1107                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1108                                 break;
1109                         sanitize_path(fname, fname, "", 0);
1110                 } else {
1111                         if (argc-- == 0)
1112                                 break;
1113                         strlcpy(fname, *argv++, MAXPATHLEN);
1114                         if (sanitize_paths)
1115                                 sanitize_path(fname, fname, "", 0);
1116                 }
1117
1118                 l = strlen(fname);
1119                 if (fname[l - 1] == '/') {
1120                         if (l == 2 && fname[0] == '.') {
1121                                 /* Turn "./" into just "." rather than "./." */
1122                                 fname[1] = '\0';
1123                         } else if (l < MAXPATHLEN) {
1124                                 fname[l++] = '.';
1125                                 fname[l] = '\0';
1126                         }
1127                 }
1128
1129                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1130                         if (f != -1) {
1131                                 io_error |= IOERR_GENERAL;
1132                                 rsyserr(FERROR, errno, "link_stat %s failed",
1133                                         full_fname(fname));
1134                         }
1135                         continue;
1136                 }
1137
1138                 if (S_ISDIR(st.st_mode) && !keep_dirs) {
1139                         rprintf(FINFO, "skipping directory %s\n", fname);
1140                         continue;
1141                 }
1142
1143                 dir = NULL;
1144                 olddir[0] = '\0';
1145
1146                 if (!relative_paths) {
1147                         p = strrchr(fname, '/');
1148                         if (p) {
1149                                 *p = 0;
1150                                 if (p == fname)
1151                                         dir = "/";
1152                                 else
1153                                         dir = fname;
1154                                 fname = p + 1;
1155                         }
1156                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1157                         /* this ensures we send the intermediate directories,
1158                            thus getting their permissions right */
1159                         char *lp = lastpath, *fn = fname, *slash = fname;
1160                         *p = 0;
1161                         /* Skip any initial directories in our path that we
1162                          * have in common with lastpath. */
1163                         while (*fn && *lp == *fn) {
1164                                 if (*fn == '/')
1165                                         slash = fn;
1166                                 lp++, fn++;
1167                         }
1168                         *p = '/';
1169                         if (fn != p || (*lp && *lp != '/')) {
1170                                 int save_copy_links = copy_links;
1171                                 int save_keep_dirs = keep_dirs;
1172                                 copy_links = copy_unsafe_links;
1173                                 keep_dirs = 1;
1174                                 while ((slash = strchr(slash+1, '/')) != 0) {
1175                                         *slash = 0;
1176                                         send_file_name(f, flist, fname, 0, 0);
1177                                         *slash = '/';
1178                                 }
1179                                 copy_links = save_copy_links;
1180                                 keep_dirs = save_keep_dirs;
1181                                 *p = 0;
1182                                 strlcpy(lastpath, fname, sizeof lastpath);
1183                                 *p = '/';
1184                         }
1185                 }
1186
1187                 if (!*fname)
1188                         fname = ".";
1189
1190                 if (dir && *dir) {
1191                         static char *lastdir;
1192                         static int lastdir_len;
1193
1194                         strcpy(olddir, curr_dir); /* can't overflow */
1195
1196                         if (!push_dir(dir)) {
1197                                 io_error |= IOERR_GENERAL;
1198                                 rsyserr(FERROR, errno, "push_dir %s failed",
1199                                         full_fname(dir));
1200                                 continue;
1201                         }
1202
1203                         if (lastdir && strcmp(lastdir, dir) == 0) {
1204                                 flist_dir = lastdir;
1205                                 flist_dir_len = lastdir_len;
1206                         } else {
1207                                 flist_dir = lastdir = strdup(dir);
1208                                 flist_dir_len = lastdir_len = strlen(dir);
1209                         }
1210                 }
1211
1212                 if (one_file_system)
1213                         set_filesystem(fname);
1214
1215                 send_file_name(f, flist, fname, recurse, XMIT_DEL_START);
1216
1217                 if (olddir[0]) {
1218                         flist_dir = NULL;
1219                         flist_dir_len = 0;
1220                         if (!pop_dir(olddir)) {
1221                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1222                                         full_fname(dir));
1223                                 exit_cleanup(RERR_FILESELECT);
1224                         }
1225                 }
1226         }
1227
1228         if (f != -1) {
1229                 send_file_entry(NULL, f, 0);
1230
1231                 if (show_filelist_p())
1232                         finish_filelist_progress(flist);
1233         }
1234
1235         if (flist->hlink_pool) {
1236                 pool_destroy(flist->hlink_pool);
1237                 flist->hlink_pool = NULL;
1238         }
1239
1240         clean_flist(flist, 0, 0);
1241
1242         if (f != -1) {
1243                 /* Now send the uid/gid list. This was introduced in
1244                  * protocol version 15 */
1245                 send_uid_list(f);
1246
1247                 /* send the io_error flag */
1248                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1249
1250                 io_end_buffering();
1251                 stats.flist_size = stats.total_written - start_write;
1252                 stats.num_files = flist->count;
1253         }
1254
1255         if (verbose > 3)
1256                 output_flist(flist, f < 0 ? "delete" : who_am_i());
1257
1258         if (verbose > 2)
1259                 rprintf(FINFO, "send_file_list done\n");
1260
1261         return flist;
1262 }
1263
1264
1265 struct file_list *recv_file_list(int f)
1266 {
1267         struct file_list *flist;
1268         unsigned short flags;
1269         int64 start_read;
1270
1271         if (show_filelist_p())
1272                 start_filelist_progress("receiving file list");
1273
1274         start_read = stats.total_read;
1275
1276         flist = flist_new(WITH_HLINK, "recv_file_list");
1277         received_flist = flist;
1278
1279         flist->count = 0;
1280         flist->malloced = 1000;
1281         flist->files = new_array(struct file_struct *, flist->malloced);
1282         if (!flist->files)
1283                 goto oom;
1284
1285
1286         while ((flags = read_byte(f)) != 0) {
1287                 int i = flist->count;
1288
1289                 flist_expand(flist);
1290
1291                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1292                         flags |= read_byte(f) << 8;
1293                 receive_file_entry(&flist->files[i], flags, flist, f);
1294
1295                 if (S_ISREG(flist->files[i]->mode))
1296                         stats.total_size += flist->files[i]->length;
1297
1298                 flist->count++;
1299
1300                 maybe_emit_filelist_progress(flist);
1301
1302                 if (verbose > 2) {
1303                         rprintf(FINFO, "recv_file_name(%s)\n",
1304                                 f_name(flist->files[i]));
1305                 }
1306         }
1307         receive_file_entry(NULL, 0, NULL, 0); /* Signal that we're done. */
1308
1309         if (verbose > 2)
1310                 rprintf(FINFO, "received %d names\n", flist->count);
1311
1312         if (show_filelist_p())
1313                 finish_filelist_progress(flist);
1314
1315         clean_flist(flist, relative_paths, 1);
1316
1317         if (f != -1) {
1318                 /* Now send the uid/gid list. This was introduced in
1319                  * protocol version 15 */
1320                 recv_uid_list(f, flist);
1321
1322                 /* Recv the io_error flag */
1323                 if (lp_ignore_errors(module_id) || ignore_errors)
1324                         read_int(f);
1325                 else
1326                         io_error |= read_int(f);
1327         }
1328
1329         if (verbose > 3)
1330                 output_flist(flist, who_am_i());
1331
1332         if (list_only) {
1333                 int i;
1334                 for (i = 0; i < flist->count; i++)
1335                         list_file_entry(flist->files[i]);
1336         }
1337
1338         if (verbose > 2)
1339                 rprintf(FINFO, "recv_file_list done\n");
1340
1341         stats.flist_size = stats.total_read - start_read;
1342         stats.num_files = flist->count;
1343
1344         return flist;
1345
1346 oom:
1347         out_of_memory("recv_file_list");
1348         return NULL;            /* not reached */
1349 }
1350
1351
1352 int file_compare(struct file_struct **file1, struct file_struct **file2)
1353 {
1354         struct file_struct *f1 = *file1;
1355         struct file_struct *f2 = *file2;
1356
1357         if (!f1->basename && !f2->basename)
1358                 return 0;
1359         if (!f1->basename)
1360                 return -1;
1361         if (!f2->basename)
1362                 return 1;
1363         if (f1->dirname == f2->dirname)
1364                 return u_strcmp(f1->basename, f2->basename);
1365         return f_name_cmp(f1, f2);
1366 }
1367
1368
1369 int flist_find(struct file_list *flist, struct file_struct *f)
1370 {
1371         int low = 0, high = flist->count - 1;
1372
1373         while (high >= 0 && !flist->files[high]->basename) high--;
1374
1375         if (high < 0)
1376                 return -1;
1377
1378         while (low != high) {
1379                 int mid = (low + high) / 2;
1380                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1381                 if (ret == 0)
1382                         return flist_up(flist, mid);
1383                 if (ret > 0)
1384                         high = mid;
1385                 else
1386                         low = mid + 1;
1387         }
1388
1389         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1390                 return flist_up(flist, low);
1391         return -1;
1392 }
1393
1394 /*
1395  * Free up any resources a file_struct has allocated
1396  * and clear the file.
1397  */
1398 void clear_file(int i, struct file_list *flist)
1399 {
1400         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1401                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1402         memset(flist->files[i], 0, file_struct_len);
1403 }
1404
1405
1406 /*
1407  * allocate a new file list
1408  */
1409 struct file_list *flist_new(int with_hlink, char *msg)
1410 {
1411         struct file_list *flist;
1412
1413         flist = new(struct file_list);
1414         if (!flist)
1415                 out_of_memory(msg);
1416
1417         memset(flist, 0, sizeof (struct file_list));
1418
1419         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1420             out_of_memory, POOL_INTERN)))
1421                 out_of_memory(msg);
1422
1423 #if SUPPORT_HARD_LINKS
1424         if (with_hlink && preserve_hard_links) {
1425                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1426                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1427                         out_of_memory(msg);
1428         }
1429 #endif
1430
1431         return flist;
1432 }
1433
1434 /*
1435  * free up all elements in a flist
1436  */
1437 void flist_free(struct file_list *flist)
1438 {
1439         pool_destroy(flist->file_pool);
1440         pool_destroy(flist->hlink_pool);
1441         free(flist->files);
1442         free(flist);
1443 }
1444
1445
1446 /*
1447  * This routine ensures we don't have any duplicate names in our file list.
1448  * duplicate names can cause corruption because of the pipelining
1449  */
1450 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1451 {
1452         int i, prev_i = 0;
1453
1454         if (!flist || flist->count == 0)
1455                 return;
1456
1457         qsort(flist->files, flist->count,
1458             sizeof flist->files[0], (int (*)())file_compare);
1459
1460         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1461                 if (flist->files[i]->basename) {
1462                         prev_i = i;
1463                         break;
1464                 }
1465         }
1466         while (++i < flist->count) {
1467                 if (!flist->files[i]->basename)
1468                         continue;
1469                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1470                         if (verbose > 1 && !am_server) {
1471                                 rprintf(FINFO,
1472                                         "removing duplicate name %s from file list %d\n",
1473                                         f_name(flist->files[i]), i);
1474                         }
1475                         /* Make sure that if we unduplicate '.', that we don't
1476                          * lose track of a user-specified starting point (or
1477                          * else deletions will mysteriously fail with -R). */
1478                         if (flist->files[i]->flags & FLAG_DEL_START)
1479                                 flist->files[prev_i]->flags |= FLAG_DEL_START;
1480
1481                         clear_file(i, flist);
1482                 } else
1483                         prev_i = i;
1484         }
1485
1486         if (strip_root) {
1487                 /* we need to strip off the root directory in the case
1488                    of relative paths, but this must be done _after_
1489                    the sorting phase */
1490                 for (i = 0; i < flist->count; i++) {
1491                         if (flist->files[i]->dirname &&
1492                             flist->files[i]->dirname[0] == '/') {
1493                                 memmove(&flist->files[i]->dirname[0],
1494                                         &flist->files[i]->dirname[1],
1495                                         strlen(flist->files[i]->dirname));
1496                         }
1497
1498                         if (flist->files[i]->dirname &&
1499                             !flist->files[i]->dirname[0]) {
1500                                 flist->files[i]->dirname = NULL;
1501                         }
1502                 }
1503         }
1504 }
1505
1506 static void output_flist(struct file_list *flist, const char *whose_list)
1507 {
1508         char uidbuf[16], gidbuf[16];
1509         struct file_struct *file;
1510         int i;
1511
1512         for (i = 0; i < flist->count; i++) {
1513                 file = flist->files[i];
1514                 if ((am_root || am_sender) && preserve_uid)
1515                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1516                 else
1517                         *uidbuf = '\0';
1518                 if (preserve_gid && file->gid != GID_NONE)
1519                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1520                 else
1521                         *gidbuf = '\0';
1522                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f%s%s\n",
1523                         whose_list, i, NS(file->basedir), NS(file->dirname),
1524                         NS(file->basename), (int)file->mode,
1525                         (double)file->length, uidbuf, gidbuf);
1526         }
1527 }
1528
1529
1530 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1531
1532 /* Compare the names of two file_struct entities, just like strcmp()
1533  * would do if it were operating on the joined strings.  We assume
1534  * that there are no 0-length strings.
1535  */
1536 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1537 {
1538         int dif;
1539         const uchar *c1, *c2;
1540         enum fnc_state state1, state2;
1541
1542         if (!f1 || !f1->basename) {
1543                 if (!f2 || !f2->basename)
1544                         return 0;
1545                 return -1;
1546         }
1547         if (!f2 || !f2->basename)
1548                 return 1;
1549
1550         if (!(c1 = (uchar*)f1->dirname)) {
1551                 state1 = fnc_BASE;
1552                 c1 = (uchar*)f1->basename;
1553         } else if (!*c1) {
1554                 state1 = fnc_SLASH;
1555                 c1 = (uchar*)"/";
1556         } else
1557                 state1 = fnc_DIR;
1558         if (!(c2 = (uchar*)f2->dirname)) {
1559                 state2 = fnc_BASE;
1560                 c2 = (uchar*)f2->basename;
1561         } else if (!*c2) {
1562                 state2 = fnc_SLASH;
1563                 c2 = (uchar*)"/";
1564         } else
1565                 state2 = fnc_DIR;
1566
1567         while (1) {
1568                 if ((dif = (int)*c1 - (int)*c2) != 0)
1569                         break;
1570                 if (!*++c1) {
1571                         switch (state1) {
1572                         case fnc_DIR:
1573                                 state1 = fnc_SLASH;
1574                                 c1 = (uchar*)"/";
1575                                 break;
1576                         case fnc_SLASH:
1577                                 state1 = fnc_BASE;
1578                                 c1 = (uchar*)f1->basename;
1579                                 break;
1580                         case fnc_BASE:
1581                                 break;
1582                         }
1583                 }
1584                 if (!*++c2) {
1585                         switch (state2) {
1586                         case fnc_DIR:
1587                                 state2 = fnc_SLASH;
1588                                 c2 = (uchar*)"/";
1589                                 break;
1590                         case fnc_SLASH:
1591                                 state2 = fnc_BASE;
1592                                 c2 = (uchar*)f2->basename;
1593                                 break;
1594                         case fnc_BASE:
1595                                 if (!*c1)
1596                                         return 0;
1597                                 break;
1598                         }
1599                 }
1600         }
1601
1602         return dif;
1603 }
1604
1605
1606 /* Return a copy of the full filename of a flist entry, using the indicated
1607  * buffer.  No size-checking is done because we checked the size when creating
1608  * the file_struct entry.
1609  */
1610 char *f_name_to(struct file_struct *f, char *fbuf)
1611 {
1612         if (!f || !f->basename)
1613                 return NULL;
1614
1615         if (f->dirname) {
1616                 int len = strlen(f->dirname);
1617                 memcpy(fbuf, f->dirname, len);
1618                 fbuf[len] = '/';
1619                 strcpy(fbuf + len + 1, f->basename);
1620         } else
1621                 strcpy(fbuf, f->basename);
1622         return fbuf;
1623 }
1624
1625
1626 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1627  */
1628 char *f_name(struct file_struct *f)
1629 {
1630         static char names[5][MAXPATHLEN];
1631         static unsigned int n;
1632
1633         n = (n + 1) % (sizeof names / sizeof names[0]);
1634
1635         return f_name_to(f, names[n]);
1636 }